Source Code Cross Referenced for CVMInterfaceMethodTable.java in  » 6.0-JDK-Modules » j2me » runtime » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » runtime 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)CVMInterfaceMethodTable.java	1.23 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package runtime;
029:
030:        import vm.*;
031:        import components.*;
032:        import consts.Const;
033:        import java.util.Hashtable;
034:
035:        /*
036:         * This is the CVM-specific subclass of vm.InterfaceMethodTable
037:         * It knowns how to write out these data structures for the CVM
038:         * This is similar to the CInterfaceMethodTable used for
039:         * JDK1.1-based systems. The substantial difference is
040:         * the ordering requirement: rather than having two representations
041:         * of interfaces, CVM has only one. Those this class implements
042:         * directly come first, followed by those inhereted.
043:         * Also note that the count of interfaced declared by the class is part of this
044:         * structure. This would seem to limit the ability of a child class to share data
045:         * with its parent in the case where the parent declares an interface
046:         * but the child does not. The CVM recognizes this case though, so this
047:         * sharing is allowed. Here's an odd example:
048:         * 	class a implements Serializeable {}
049:         *	class b extends a {}
050:         *		// b shares a's interface table
051:         *	class c extends a implements Serializeable {}
052:         *		// c cannot share a's interface table
053:         *		// though they are identical!
054:         */
055:
056:        class CVMInterfaceMethodTable extends vm.InterfaceMethodTable {
057:
058:            // names we generate
059:            public static final String vectorName = "CVMinterfaceVector";
060:
061:            int implements Count;
062:            boolean generated;
063:
064:            public CVMInterfaceMethodTable(ClassClass c, String n,
065:                    InterfaceVector v[]) {
066:                super (c, n, v);
067:                implements Count = (c.ci.interfaces == null) ? 0
068:                        : c.ci.interfaces.length;
069:                generated = false;
070:            }
071:
072:            private static void sortInterfaceVectors(ClassInfo c,
073:                    InterfaceVector v[], boolean isInterface) {
074:                /*
075:                 * Each of these interface vectors is correct, BUT order matters
076:                 * We want to make sure that the entries for interfaces declared directly
077:                 * by us come first in the list, AND that they are in the order declared!
078:                 * so do a simple sort of them here.
079:                 */
080:                ClassConstant interfaces[] = c.interfaces;
081:                int implements Count = interfaces.length;
082:                int l = v.length;
083:                for (int i = 0; i < implements Count; i++) {
084:                    ClassInfo this Interface = interfaces[i].find();
085:                    for (int j = i; j < l; j++) {
086:                        if (v[j].intf == this Interface) {
087:                            if (i != j) {
088:                                // swap
089:                                InterfaceVector t = v[i];
090:                                v[i] = v[j];
091:                                v[j] = t;
092:                            }
093:                            break;
094:                        }
095:                    }
096:                }
097:                if (isInterface) {
098:                    /*
099:                     * put this class itself next.
100:                     */
101:                    // this will fail badly if this class is not present.
102:                    int j = implements Count;
103:                    while (v[j].intf != c) {
104:                        j++;
105:                    }
106:                    if (j != implements Count) {
107:                        // swap
108:                        InterfaceVector t = v[implements Count];
109:                        v[implements Count] = v[j];
110:                        v[j] = t;
111:                    }
112:                }
113:            }
114:
115:            private static InterfaceMethodTable generateTablesForInterface(
116:                    ClassInfo c) {
117:                //
118:                // We generate a thing like an imethodtable for interfaces, too.
119:                // But its different enough that I'm treating it separately, here.
120:                //
121:                // Cannot share our imethotable with our superclass,
122:                // as it must at least include ourselves!
123:                //
124:                ClassClass me = c.vmClass;
125:                int ntotal = c.allInterfaces.size();
126:                InterfaceVector ivec[] = new InterfaceVector[ntotal + 1];
127:
128:                // first the entry for ourselves.
129:                ivec[0] = new InterfaceVector(me, c, null);
130:                // now all the others (if any)
131:                for (int i = 0; i < ntotal; i++) {
132:                    ClassInfo intf = (ClassInfo) c.allInterfaces.elementAt(i);
133:                    ivec[i + 1] = new InterfaceVector(me, intf, null);
134:                }
135:                sortInterfaceVectors(c, ivec, true);
136:                return new CVMInterfaceMethodTable(c.vmClass, "CVM_"
137:                        + c.getGenericNativeName() + "_intfMethodtable", ivec);
138:            }
139:
140:            /*
141:             * Modified version from vm.InterfaceMethodTable for 
142:             * handling the special ordering and sharing needs of CVM.
143:             */
144:            public static InterfaceMethodTable generateInterfaceTable(
145:                    ClassClass cc) {
146:                ClassInfo c = cc.ci;
147:                if (c.allInterfaces == null)
148:                    c.findAllInterfaces();
149:                ClassInfo sup = c.super ClassInfo;
150:                int ntotal = c.allInterfaces.size();
151:                int nsuper  = 0;
152:                int implements Count = (c.interfaces == null) ? 0
153:                        : c.interfaces.length;
154:
155:                if ((c.access & Const.ACC_INTERFACE) != 0) {
156:                    return generateTablesForInterface(c);
157:                }
158:                if (sup != null) {
159:                    if (sup.vmClass.inf == null) {
160:                        // generate parental information,
161:                        // that we might borrow it.
162:                        sup.vmClass.inf = generateInterfaceTable(sup.vmClass);
163:                    }
164:                    if (implements Count == 0) {
165:                        // CVM allows sharing with parent if we have no
166:                        // declared interfaces ourselves.
167:                        // use other class's tables entirely.
168:                        // we have nothing further to add.
169:                        return sup.vmClass.inf;
170:                    }
171:                }
172:                //
173:                // generate the offset tables, or symbolic references
174:                // to them.
175:                InterfaceVector vec[] = new InterfaceVector[ntotal];
176:                if (nsuper  != 0) {
177:                    // borrow some from superclass. They are the same.
178:                    System.arraycopy(sup.vmClass.inf.iv, 0, vec, 0, nsuper );
179:                }
180:
181:                // compute the rest of the thing ourselves.
182:                for (int i = nsuper ; i < ntotal; i++) {
183:                    ClassInfo intf = (ClassInfo) c.allInterfaces.elementAt(i);
184:                    vec[i] = generateInterfaceVector(c, intf);
185:                }
186:
187:                /*
188:                 * Each of these interface vectors is correct, BUT order matters
189:                 * We want to make sure that the entries for interfaces declared directly
190:                 * by us come first in the list, AND that they are in the order declared!
191:                 * so do a simple sort of them here.
192:                 */
193:                sortInterfaceVectors(c, vec, false);
194:
195:                return new CVMInterfaceMethodTable(cc, "CVM_"
196:                        + c.getGenericNativeName() + "_intfMethodtable", vec);
197:            }
198:
199:            static void writeInterfaceTables(ClassClass[] classes,
200:                    CCodeWriter out, CCodeWriter headerOut) {
201:
202:                int n = classes.length;
203:                // generate the tables. generateInterfaceTable must work
204:                // recursively, of course!
205:                for (int i = 0; i < n; i++) {
206:                    ClassClass c = classes[i];
207:                    if (c.inf == null)
208:                        c.inf = generateInterfaceTable(c);
209:                }
210:
211:                //
212:                // print the vectors first.
213:                //
214:                out.println("STATIC const CVMUint16 " + vectorName + "[] = {");
215:                int offset = 0;
216:                boolean emptyVector = true;
217:                for (int i = 0; i < n; i++) {
218:                    ClassClass c = classes[i];
219:                    CVMInterfaceMethodTable simt = (CVMInterfaceMethodTable) c.inf;
220:                    if (simt == null || simt.parent != c)
221:                        continue;
222:                    InterfaceVector iv[] = simt.iv;
223:                    for (int j = 0; j < iv.length; j++) {
224:                        InterfaceVector vec = iv[j];
225:                        if (vec.generated)
226:                            continue; // done.
227:                        vec.generated = true;
228:                        vec.offset = offset;
229:                        short vector[] = vec.v;
230:                        if ((vector == null) || (vector.length == 0)) {
231:                            continue;
232:                        }
233:                        int num = vector.length;
234:                        emptyVector = false;
235:                        out.comment(simt.parent.ci.className + " "
236:                                + vec.intf.className);
237:                        for (int k = 0, mod = 0; k < num; k++) {
238:                            if (mod == 0)
239:                                out.write('\t');
240:                            out.printHexInt(vector[k]);
241:                            out.write(',');
242:                            if (++mod == 8) {
243:                                out.write('\n');
244:                                mod = 0;
245:                            }
246:                        }
247:                        if ((num % 8) != 0)
248:                            out.write('\n');
249:                        offset += num;
250:                    }
251:                }
252:                if (emptyVector) {
253:                    out.write('0');// make it non-empty!
254:                }
255:                out.println("};\n");
256:                // end vectors.
257:
258:                //
259:                // now write out the CVMInterfaces structures, which
260:                // roughly correspond to the InterfaceMethodTables.
261:                // But not quite.
262:                //
263:                for (int i = 0; i < n; i++) {
264:                    ClassClass c = classes[i];
265:                    CVMInterfaceMethodTable simt = (CVMInterfaceMethodTable) c.inf;
266:                    if (simt != null) {
267:                        simt.write(out, headerOut);
268:                    }
269:                }
270:            }
271:
272:            private static boolean needVector(InterfaceVector vec) {
273:                if (vec.v == null || vec.v.length == 0)
274:                    return false; // don't bother.
275:                return true;
276:            }
277:
278:            private static java.util.BitSet interfaceSizes = new java.util.BitSet();
279:            private static final String interfaceStructName = "CVMinterface";
280:
281:            //struct CVMInterfaces {
282:            //    CVMUint16      interfaceCount;
283:            //    CVMUint16      implementsCount;
284:            //    union {
285:            //        CVMUint16* interfaces;
286:            //        struct {
287:            //            CVMClassBlock* interfacecb;
288:            //            CVMUint16*     index;
289:            //        } interfaceTable[1];
290:            //    } intfInfo;
291:            //}; 
292:
293:            private static String declareInterfaceStruct(int n, CCodeWriter out) {
294:                String interfaceFlavor = "union " + interfaceStructName + n;
295:                if (!interfaceSizes.get(n)) {
296:                    out.println(interfaceFlavor + " {");
297:                    out.println("    struct {");
298:                    out
299:                            .println("        CVMUint16 interfaceCount; CVMUint16 implementsCount;");
300:                    out
301:                            .println("        struct { const CVMClassBlock* interfacecb;"
302:                                    + " union {CVMUint16 * addr; CVMClassTypeID ti;} ext;"
303:                                    + "} interfaceTable[" + n + "];");
304:                    out.println("    } dontAccess;");
305:                    out.println("    CVMInterfaces interfaces;");
306:                    out.println("};");
307:                    interfaceSizes.set(n);
308:                }
309:                return interfaceFlavor;
310:            }
311:
312:            public void write(CCodeWriter out, CCodeWriter headerOut) {
313:                if (this .generated)
314:                    return;
315:                this .generated = true;
316:                if (iv.length == 0) {
317:                    // omit structures of length 0
318:                    return;
319:                }
320:                String structType = declareInterfaceStruct(iv.length, headerOut);
321:                /* 
322:                 * Added 'extern' keyword, so that the header file does not
323:                 * declare an (unnecessary) global variable for each struct
324:                 * declaration (which would never be used anyway) */
325:                headerOut.println("extern const " + structType + " " + name
326:                        + ";");
327:                out.print("const " + structType + " " + name);
328:                out.print(" = {{\n\t");
329:                out.print(iv.length);
330:                out.print(", ");
331:                out.print(implements Count);
332:                out.println(", {");
333:                for (int i = 0; i < iv.length; i++) {
334:                    InterfaceVector entry = iv[i];
335:                    ClassInfo intf = entry.intf;
336:                    String intfName = intf.getGenericNativeName();
337:                    out.print("\t{ ");
338:                    out.print("(CVMClassBlock*)&" + intfName);
339:                    out.print("_Classblock.classclass,");
340:                    if (needVector(entry)) {
341:                        /*
342:                         * Cast to first type in union (CVMUint16 *).
343:                         */
344:                        out.print("{(CVMUint16 *)&" + vectorName + "["
345:                                + entry.offset + "]}");
346:                    } else {
347:                        /*
348:                         * Cast to first type in union (CVMUint16 *).
349:                         */
350:                        out.print("{(CVMUint16 *)0}");
351:                    }
352:                    out.println(" },");
353:                }
354:                out.write('}');
355:                out.println("}};");
356:            }
357:        }
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